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2 Sheets-Sheet 1.

(Model.)

W. S. PISKE.

LOCK.

Patented Mar. 5, 1889.

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UNITED STATES PATENT @rricn.

\YILLIAM SHERWOOD FISKE, OF BROOKLYN, NEV YORK, ASSIGNOR TO THE HOPKINS LQ. DICKINSOX MANUFAC'IURING COh'lPANY, OF SAME PLACE.

LOCK.

SPECIFICATION forming part of Letters Patent No. 399,026, dated March 5, 1889.

Application filed September 1, 1887. Serial No. 243,519. (MOdCi-i To (1,15 whom it may concern.-

Be it known that I, WILLIAM SHERWOOD FIsKE, a citizen of the United States, resident at Brooklyn, in the count vot' Kings and State thereon, which form a part of this specification.

Figure 1 is a bot-tom view of lock-case A, with vcasing -lti in place. Fig. 2 is a bottom view of cylinder-lock with slide l2 in unlocked position. Fig. 3 is aside elevation of cylinder-lock. Fig. 4 is a top view of cylinderlock. Fig. 5 is a side elevation of cylinder lock with casing 46 removed, broken away, showing pin 53 and spring 54. Fig. 6 is a side elevation of cylinder-lock, casing removed, with piece 150 removed, and ends of tumblers 7t k 7; broken away, showing springs m m m, and also springs t. Fig. 7 is a top view of cylindenlock with casin g 46 removed. Fig. 8 is a top view of revolving cylinder with springs and tumblers removed. Figs. 9 and 10 are detail side elevations of tumblers. Fig. 11 is a detail top view of piece 150. Fig. 12 shows the lock and mechanism to which the cylinder-lock is applied.

The invention relates to improvements in cylinder-locks and no vel combination of parts, as hereinafter set forth.

The object of my invention is to provide a night-latch lock to be used in combination with and acted upon by certain parts of a mortise-lock, for which separate application for Letters Patent has been made under even date and numbered 248,520, a portion of which is illustrated in Fig. 12 herewith, but not claimed in this application, and, further, to provide a night-latch lock that will operate the latch and lock-bolts of the mortise-lock without it being necessary to use the knob connected with said mortise-lock.

Referring by letter and numerals to the accompanying drawings, 46 represents the cylinder-case, provided in its outer face with the central circular opening, 47, through which the key is introduccdinto the revolving plug hereinafter explained. The cylinder-case is provided on its inner edge with the lip or flange 21-, by which it secured in the opening y of the mortise-lock case. The central circular opening, 47, of the cylinder-case is provided with the radiatcly-disposed recess 50, with which the slot 51 in the removable plate ,52 on the outer end of the revolving plug 49 registers. Said plug i9 is provided with a seat or pin-hole, 52, opposite the open end of the slot 51 in the plate 52 for the reception of a shouldered or headed locking-pin, 53. 5% is a spiral spring which encircles the pin 53, and bears against a shoulder, 56, in the seat or pin-hole and against a shoulder, 55, of the pin 53, and tends normally to project the pin into the recess 50, and thereby locks the plug 49 and prevents it from being turned until the pin is pushed in by the proper key having a projecting lip that will engage said pin.

The revolving plug is provided with five tumblers, K K K K K, notched transversely at their inner ends, the tumblers K and K notched as at c, and the tumblers K, K and K notched as at d. These tumblers are also provided with. arms at their outer ends. The arms Z of the tumblers K K are on the same side as the notches 0, while the arms m of the tumblers K, K and K are on the opposite side of the notches (1. These tumblers are held in their normal position in the revolving plug by spiral springs m and i, said springs hearing against the inner edges of the armsl and m of thetumblers. These tumblers are placed in the revolving plug so that the notches c and d. are on the same side.

Short parallel longitudinal integral ribs a and a extend to the face of the seatu of the plate 52, and between them and the sides thereof parallel longitudinal grooves q g Q2 are formed, in which the springs at work. The tumblers K and K work in grooves s and s of a removable side piece, 150, and are held in their normal position. by the spiral springs 16, seated in depressions u and u in the body of the plug. The revolving plug is provided 011 its inner face with a sliding plate, 13, said plate being provided with aprojecting lug, p, and a rectangular opening, 19*. l9 is a projecting arm or stud on -the inner face of the revolving plug, for a purpose hereinafter explained.

To operate the mortise-lock with the cylinder-lock, place the key in the slot 51, and by pressing the key inward the tumblers ,are depressed. The notches c d are then opposite one edge of the rectangular opening in the sliding platep. By turning the key, which will turn the revolving plug, the lug 011 the sliding plate is brought in contact with the eccentric flange y",tormed on the case of the mortise-lock, and forces the plate 1:) to engage the notches c and d, and thus hold them While operating the mortise-lock. By continuing to turn the key the arm 49 enters the notch O of the lock-bolt stem 18 of the mortiselock and forces said bolt into its keeper. As the bolt is projected the slotted sliding fence 7, by means of the spring 18 forces the bent end 6 of said fence into recess 5 of the latchbolt, so that when it is necessary to unlock or retract the lock-bolt, by turning the key in the opposite direction from that employed in looking, the arm 49 again coming in contact with the notch retracts both the lock and the latch-bolt. Before the key can be removed from the revolving plug the arm 49 comes in contact with the arm 7 of the sliding fence 7, and withdraws the bent end 6 of said fence from the recess of the latch-bolt and permits said latch-bolt to project again into its keeper. At the same time the sliding plate comes in contact with the flange y and releases the tumblers and permits the key to be withdrawn from the revolving plug.

l-Iaving described my invention, what I claim is 1. In a cyli1'1der-lock, the combination, with the cylinder-case, having the opening 47, and

the revolving plug, of the slotted sliding plate,

the lug thereon, and the tumblers engaging a slot in said plate, the said plate adapted to operate against the eccentric flange of a mortise-lock, substantially as specified.

2. In a cylinder-lock, the combinatiomwiththe case and therevolving plug, of the slotted plate seated in bevel grooves in the plug and having the key-slot, and the tumblers having the actuating-springs, substantially as specified.

3. The combination, with the cylinder-case having the central opening provided with a radially-disposed slot, of the revolving plug provided with the shouldered spring-pressed 

